audio frequency magnetic method
... aubrite 顽火无球粒陨石 audio frequency magnetic method 声频磁法 augen kohle 眼状煤 ...
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In the design, in view of the breakdown different form, has studied the sound detection law, the pulse magnetic field law, the audio frequency induction method and so on each method principle.
在设计中，针对故障的不同形式，研究了声测法、脉冲磁场法、音频感应法等各种方法的原理。
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